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09-07-2016, 04:44 AM
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#1
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Montana Master
Join Date: Apr 2004
Location: Ontario
Posts: 722
M.O.C. #1328
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Unpleasant surprise
Last weekend Donna says the water heater isn't working on electric, gas is ok so I wait till we got home to trouble shoot it. Find the breaker is tripped, reset it but still no heat. Trace the circuit and no AC to the element. Trace back to the ac switch in the WH and no AC. Look at the schematic and discover that there is a relay in the junction box on the heater. Of course it's on the side that's not directly accessible. I order a replacement relay on Amazon and yesterday proceed to pull the heater about 10 inches to get access to the junction box, below is what I found. The first picture is the AC wire that feeds the relay, it has a small nick where it was up against the ground screw and was burned back past the wire nut into the feed line by almost 2 inches. The second picture is the wire nut from the neutral side, the hot side only had the spring wire remaining. Glad the junction box, ground and circuit breaker did the job. By the way the relay is fine.
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Mike & Donna Ishler Ontario, NY KE2LU FN13
2017 3720RL TST S637's
2017 Dodge 3500 Laramie CTD 4x4 Auto
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09-07-2016, 07:06 AM
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#2
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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Unpleasant surprise, I would say! Sounds like you did a nice job troubleshooting and fixing.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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09-07-2016, 08:27 AM
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#3
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,154
M.O.C. #6433
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Curious. I know it is switch to 120 vac, but is the relay coil 120 vac or 12 vdc?
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Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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09-07-2016, 08:40 AM
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#4
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Montana Master
Join Date: Apr 2004
Location: Ontario
Posts: 722
M.O.C. #1328
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The coil is 12vdc. Took me a while to figure it out, the coil is on the dc schematic and the switch is on the AC schematic.
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Mike & Donna Ishler Ontario, NY KE2LU FN13
2017 3720RL TST S637's
2017 Dodge 3500 Laramie CTD 4x4 Auto
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09-07-2016, 03:32 PM
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#5
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Montana Master
Join Date: Jan 2005
Location: North Ridgeville
Posts: 20,229
M.O.C. #2839
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Mine did that two winters ago in Florida same problem same place.
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09-08-2016, 04:18 AM
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#6
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Montana Master
Join Date: Dec 2009
Location: Sebring
Posts: 3,657
M.O.C. #9969
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Yep, been there done that. Most don't realize the switch inside for the Electric side of the HW heater is a 12V switch and it controls the relay on the heater. AC runs direct from the breaker panel to the relay.
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Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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09-08-2016, 12:23 PM
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#7
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Montana Master
Join Date: Apr 2004
Location: Ontario
Posts: 722
M.O.C. #1328
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Wow Rich I was surprised it happened twice, what are the odds?
__________________
Mike & Donna Ishler Ontario, NY KE2LU FN13
2017 3720RL TST S637's
2017 Dodge 3500 Laramie CTD 4x4 Auto
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